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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37a165fc3933742176d513819d7ed1c0bb7f01d5c28b3aa1ba51bf82f582064' 
  AND token = 'ddi5QQyIwgoL0Xacfm4iZ5vHxhVPGc1S6DvkdOZKEKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}